Yukimura and the others will be giving presentations at the summer study sessions. There's less than a month left until the training camp, but Kosuke still hasn't picked a research theme. Professor Ikeda suggests research into "an algorithm that could instantly find the True End in any dating game." On the other hand, Yukimura and Himuro are focused on the hormone which is released when a person is touched by someone they love - oxytocin. By investigating the amount present in a person's saliva, they think they might be able to determine if the person loves the one who touched them, and they decide to immediately put it to the test with some close contact...
So that's why you needed saliva.
.لهذا السبب كنتما في حاجة للّعاب
Deshalb brauchtet ihr also meine Spucke.
Así que por eso necesitaban la saliva.
Así que por eso queríais la saliva.
C’était pour ça
que vous vouliez ma salive…
Ecco perché vi serviva la saliva.
É por isso que você precisava de saliva!
Так вот зачем вам была нужна слюна.